docs: correct kickoff path to AgentExecutor

agent.kickoff() uses AgentExecutor and returns LiteAgentOutput; it does
not run through a LiteAgent class. Update Secure Agent Design and the
Agents concept note accordingly.

Co-authored-by: Rip&Tear <theCyberTech@users.noreply.github.com>

docs/edge/en/concepts/agents.mdx

@@ -638,9 +638,10 @@ asyncio.run(main())
 ```
 
 <Note>
-  The `kickoff()` method uses a `LiteAgent` internally, which provides a simpler
-  execution flow while preserving all of the agent's configuration (role, goal,
-  backstory, tools, etc.).
+  The `kickoff()` method uses an `AgentExecutor` directly (no Task or Crew),
+  which provides a simpler execution flow while preserving all of the agent's
+  configuration (role, goal, backstory, tools, etc.). It returns a
+  `LiteAgentOutput`.
 </Note>
 
 ## Important Considerations and Best Practices

docs/edge/en/guides/agents/secure-agent-design.mdx

@@ -24,7 +24,7 @@ Use this guide whenever an agent touches user data, external content, or side-ef
 
 ### Single-agent `kickoff()`
 
-`agent.kickoff(...)` runs through a LiteAgent — no Task and no Crew. Controls differ:
+`agent.kickoff(...)` runs through an `AgentExecutor` — no Task and no Crew. Controls differ:
 
 | Still applies | Does **not** apply |
 | --- | --- |